Effects of High Temperature Heat Treatment on Microstructure and Mechanical Properties of Mo-0.9La Alloy Sheets

Mo-0.9La alloy sheets with large deformation(over 97%)were prepared by powder metallurgy technology.The effects of different heat treatment temperatures on the microstructure and mechanical properties of Mo-0.9La alloy sheets were studied. The results show that, with the increase of heat treatment temperature, the microstructure of Mo-0.9La alloy transforms from fine fibre to lath structure, which is about 35 μm, and the tensile strength, yield strength and hardness of Mo-0.9La alloy decrease.At 1500 ℃, the elongation of Mo-0.9La alloy is highest, reaching 22%.